Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0415e74ab8d7b7b…

MALICIOUS

PDF

76.5 KB Created: 2021-01-14 06:05:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b6e4020b1259ef3627ac76929e77b808 SHA-1: eda212d100a26bf46f346e2f082ae3d044dd8e56 SHA-256: a0415e74ab8d7b7bbaa83391f80fa6c2a577064fc198a15d7081c521b87db3d1
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://traffset.ru/wb?keyword=top%20marketing%20companies%20to%20work%20for PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4465394/normal_5ff91917d51d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380384/normal_5fa375e872650.pdfIn PDF document text
    • https://kuruxeronujupo.weebly.com/uploads/1/3/4/4/134477992/nikuwex_fokotojogota_zanojorexaxugom.pdfIn PDF document text
    • https://site-1174752.mozfiles.com/files/1174752/kowabudatobolif.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451225/normal_5febf3f5c0158.pdfIn PDF document text
    • https://site-1168289.mozfiles.com/files/1168289/dubaxamugejaz.pdfIn PDF document text
    • https://site-1168528.mozfiles.com/files/1168528/stainless_steel_sheet_metal_gauge_to_inches.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386074/normal_5fbaa7d509b72.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384320/normal_5f983ca4c81e9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386849/normal_5fddc163566c4.pdfIn PDF document text
    • https://site-1177354.mozfiles.com/files/1177354/best_free_apps_to_learn_spanish_while_driving.pdfIn PDF document text
    • https://site-1175287.mozfiles.com/files/1175287/fotededodafepaweburirowob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366348/normal_5f889329cba05.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF2 5196 bytes
SHA-256: 1fa67ad483fb2670be056c529bef1900990efc548133b646813879fa5fba7647
font_01_sfnt_off0000ef92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF92 11804 bytes
SHA-256: c72487089aa2ddc6cfb8168d43fe335ca48f504d12416fa2b5f4ee72dc1834ea
font_02_sfnt_off000116cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116CF 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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